Writing-tablet



. FRANK.

WRITING TABLET.

APPLICATION man MAR.2.1916.

Patented Apr. 20, 1920.

(bm ifi A /qfawfrs JOSEF FRANK, OF FRANKFORT-ON-THE-MAIN,GERMANY.

WRITING-TABLET.

Specification of Letters Patent. Patented Apel'. 20, 1920.

Application led March 2, 1916. Serial No. 81,617.

To all whom t may concern:

Be it known that I, JOSEF FRANK, citizen of the German Empire, and resident of Frankfort on the Main, Germany, with the post-office address Kettenhofweg 59, have invented new and useful Improvements in VVriting-Tablets, of which the following is a specification.

My invention relates to writing tablets of every kind but especially to check books and the object is to render visible the removal of one or more leaves from said tablets from the middle of the series of leaves.

For this purpose every leaf of the tablet is marked or designated on its margin,

preferably on the front edge. These designations are arranged 1n such a manner that they represent a complete system, which in case anywhere a leaf has been removed from the middle of the series, shows incomplete or irregular passages, thus indicating the fraudulent removal of one or more leaves to the observer. The following specification serves for illustrating my invention and to show the different methods by which the same may be accomplished, reference being made to the accompanying drawings, in which- Figures l, 2 and 3 show three different modifications according to my invention, while Fig. 4 shows a special detail thereof.

Fig. 5 is a detail perspective view illustrating another form of my invention.

Fig. l represents a modification, according to which the several leaves of the tablet for blank forms are alternately provided with a colored front edge.

As shown by Fig. 1 a regular aspect is secured by the alternately colored and noncolored margins in case no leaf has been removed from the middle of the series.

In the drawings, Fig. 1, the colored front edges are designated by the numeral l, while 2 designates the colorless margins.

Should one or more leaves have been removed from the middle of the series, the regularity of theaspect as described will be destroyed, thus indicating to the observer fraudulent use.

Fig. 2 shows another modification, according to which each leaf is provided with a marking-stripe 3 at the front.

The several stripes 3 are so arranged on the sheets following each other that a checkerboard effect is produced.

Another modification is illustrated by lFig. 3. As shown :the marking lsystem Arepresented by :a -plurality .of colored -or otherwise distinguished stripes or squares 4, which are arranged at the front of the sheets.

These marking-squares are distributed upon the several leaves in such manner, that they present a checkered aspect at the margin.

It is obvious, that also by this arrangement any removal of one or more sheets from the middle of the tablet will be remarked at once.

Other modifications of the invention than those described hereinbefore and illustrated by the drawings are possible; for instance the leaves may be provided with holes or notches at the margin, for instance as shown in Fig. 5, which are likewise adapted to indicate to the observer the removal of the leaves of the tablet, when they are disposed in a manner similar to the colored designations referred to with reference to Figs. 1 3 of the drawings.

The last described modification will be preferably used in such cases, where the leaves of a tablet are of different color.

In order to properly facilitate the use of the marked tablet, it is recommendable to bind the sheets obliquely, as shown at 5, Fig. 4 of the drawings, that is to say in such a manner that the plane of the front edge does not form a right but an oblique angle with the plane of the tablet.

This arrangement makes it possible to observe whether any leaves have been removed from the center of the tablet, without requiring the observer to turn it over or press aside the leaves.

It is to be observed, that still other modifications may be made but the main object of my invention is to so designate the several leaves of a tablet so that fraudulent use, especially in the case of a check-book, will be indicated to the observer at a glance.

When I speak of books in my claim, I mean to include all articles comprising an assemblage of pages such as check books, ledgers and the like to whichl it would be desirable to apply some means for indicating the removal of a page from said assemblage.

Vhen I speak in my claim of each leaf being provided with indicating elements I also mean to include alternately marked and unmarked leaves.

NOW what claim and desire to secure by Letters Patent is the following:

A book comprising a plurality of leaves bound together at one edge and indicating devices located on the one face of at least some of the leaves, contiguous to a free marginal edge thereof, said devices contrasting in color with that of the leaves and being located in predetermined arrangement to form a visible pattern When the leaves are assembled, the continuity of the pattern being destroyed upon removal of a leaf whereby `said removal is readily detected.-

That I claim the foregoing as my inven 15 tion, I have signed my name in presence of tWo Witnesses, this tWenty-siXth day of January 1916. f

JOSEF FRANK. Witnesses:

JEAN GRUND, CARL GRUND. 

